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circuit
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  电路
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  circuit
Some combinatorial optimization problems arising from VLSI circuit design
      
This paper is basically a survey to show a number of combinatorial optimization problems arising from VLSI circuit design.
      
A packing of the complete directed symmetric graph DKv with m-circuits, denoted by (v,m)-DCP, is defined to be a family of arc-disjoint m-circuits of DKv such that any one arc of DKv occurs in at most one m-circuit.
      
According to different mechanics and analytical models, end force resulting from open magnetic circuit of PMLSM was greatly decreased by optimizing the length of the PMLSM mover.
      
The coupling ratio of the two MMI couplers deviates from 50:50 but the deviation is nearly the same, which is decided by good uniformity of semiconductor planar lightwave circuit (PLC) process.
      
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With the rapid progress of the electronic art, there has been a steadily increasing demand for still wider-bandwidth amplifiers. The recent introduction of distributed amplification concept has provided a new technique and powerful means for designing amplifiers with top cutoff frequencies far in excess of those previously obtainable with,ordinary amplifier circuits. A distributed amplifier of the low-pass type can easily be constructed to have a uniform frequency response from audio frequencies to frequencies...

With the rapid progress of the electronic art, there has been a steadily increasing demand for still wider-bandwidth amplifiers. The recent introduction of distributed amplification concept has provided a new technique and powerful means for designing amplifiers with top cutoff frequencies far in excess of those previously obtainable with,ordinary amplifier circuits. A distributed amplifier of the low-pass type can easily be constructed to have a uniform frequency response from audio frequencies to frequencies as high as several hundred me using conventional vacuum tubes. Unlike conventional circuits, distributed amplifiers have an attainable gain-bandwidth product which is not limited by shunt capacitance associated with the vacuum tubes and circuit wiring; the high-frequency limit being determined entirely by high-frequency effects within the tube proper.The purpose of this paper is to describe the basic principle of distributed amplification and to show how such an amplifier employing various types of transmission lines may be designed. Practical methods hi design and design details are given for a three-stage distributed amplifier, using fourteen 6AK5 pentodes with a frequency response of 0.1 mo to 140 mo and a gain of 33±1 db.Both the negative mutual-inductance m-derived and constant K artificial delay lines hare been used. The former offers the advantage of a more linear phase characteristic and a more uniform response both in amplitude and delay time.The experimental results corroborate the predictions based on the first-order theory described in this paper.

分布式放大是最近宽频带放大的最大成就,过去多年来电子学所应用的各种宽频带放大方法,其高频部分因受电子管电容和线路的分布电容所限制,不能获得理想的结果,而利用分布式放大的理论,所制成的宽频带放大器,远较一般普通的宽频带放大器,有更为宽阔的频带;从它的设计和构造上来看,也较负反馈的宽频带放大器为简单。制造一架自数千周至数百兆周的分布式放大器,在技术上并没有很大困难。本文拟对分布式放大的原理作扼要的分析;并提出了采用各类型仿真线所构成的分布式放大器的设计方法,并利用该设计方法,试作了一只三级十四管的分布式放大器,其增益为33±<1分贝,频宽自100千周至140兆周。由实验结果证明,采用m导出式低通滤波器所构成的仿真线的分布式放大器,实较用常K式者,具有更佳的相移特性和频率特性,这与理论上的分析是一致的。

This article introduces a new circuit of wide band square-wave generator, producing square-waves from 15 Hz to 1.2 MHz in seven steps, with rise time, of about 0.04 μs., the highest out put-signal level being13.5 v. peak to peak.Finally, some experimental examples of square-wave application are given.

本文介绍一个矩形波发生器的新电路,可以产生七种不同频率(由15赫至1.2兆赫)的矩形电压,建立时间约0.04微秒,轮出的最大振幅达13.5伏。后面还提出一些应用矩形电压的实验范例。

This article, a result of research work caried On in connection with Teaching, aims at presenting an analysis of the basic circuit of the resistance strain gage withaut amplifier, including therin (1) a computation of the relation between the resistance of each branch of the bridge and the sensitivity of galvanometer on the one hand and the sensitivity of the gage on the other and (2) a brief discussion of the limitations in regard to both the construction and the utilization of the strain gage without...

This article, a result of research work caried On in connection with Teaching, aims at presenting an analysis of the basic circuit of the resistance strain gage withaut amplifier, including therin (1) a computation of the relation between the resistance of each branch of the bridge and the sensitivity of galvanometer on the one hand and the sensitivity of the gage on the other and (2) a brief discussion of the limitations in regard to both the construction and the utilization of the strain gage without amplifier Itconcludes with a constructive critieism of Comrade Yu-chuan Chia's article appeared in the second issue of the periodical with the title "The Resistance Strain Gage for Static Deformation—Its Design and Its Construction."

本文是結合敎學工作進行研究的一個結果,提供了對不帶放大器的電阻應變儀基本電路的分析,包括(1)電橋各臂的電阻和檢流計的靈敏度與應變儀靈敏度的關係的計算;和(2)對不帶放大器的應變儀在製造和使用方面的限制的簡短討論。並提出對本刊第二期贾有權同志:“测靜荷的電阻式應變儀的設計和製造”一文的一些改進意見。

 
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